Rhodium-catalyzed phenylation of N-arylsulfonyl aldimines with sodium tetraphenylborate or trimethyl(phenyl)stannane
作者:Masato Ueda、Norio Miyaura
DOI:10.1016/s0022-328x(99)00562-8
日期:2000.1
The rhodium-catalyzedaddition reactions of trimethyl(phenyl)stannane and sodium tetraphenylborate to N-phenylsulfonyl aldimines RCHNSO2Ph (R=alkyl and aryl) provided R(Ph)CHNHSO2Ph in high yields. A cationic and free phosphine complex [Rh(cod)(MeCN)2]BF4 was found to be an efficient catalyst for the addition of PhSnMe3, whereas [Rh(cod)(MeCN)2]BF4/dppb catalyzed the addition of Ph4BNa to various
Chiral Guanidinium Salt Catalyzed Enantioselective Phospha-Mannich Reactions
作者:Xiao Fu、Wei-Tian Loh、Yan Zhang、Tao Chen、Ting Ma、Hongjun Liu、Jianmin Wang、Choon-Hong Tan
DOI:10.1002/anie.200903971
日期:2009.9.21
Zero, one, or two? Guanidinium catalyst 1⋅HBArF4 (ArF=3,5‐(CF3)2C6H3, Bn=benzyl, Ts=4‐toluenesulfonyl) was obtained in a single step from a commercially available diamine. By using this catalyst an asymmetric phospha‐Mannich reaction has been developed, involving secondary phosphine oxides and H‐phosphinates as the P nucleophile. A series of enantiomerically enriched α‐amino phosphine oxides (2), α‐amino
Highly efficient and diastereoselective synthesis of 1,3-oxazolidines featuring a palladium-catalyzed cyclization reaction of 2-butene-1,4-diol derivatives and imines
A palladium-catalyzed protocol for effective synthesis of 1,3-oxazolidines has been reported. This method is featured by the high diastereoselectivity (dr up to >98/2) and using the readily available 2-butene-1,4-diol derivatives and imines as substrates.
The synthesis of 4‐sulfonyl‐3‐pyrrolines, from a propargylic sulfone and activated imines, is described. The annulation is initiated by sodium benzenesulfinate as organocatalyst, which allows isomerization of the alkynyl precursor to the analogous allene. A proof of concept towards an asymmetric version involving an unprecedented enantiopure sulfinate–ammonium cooperative ion pair was then highlighted
Catalytic Enantioselective Synthesis of α,β-Diamino Acid Derivatives
作者:Le Li、Madhu Ganesh、Daniel Seidel
DOI:10.1021/ja9034494
日期:2009.8.26
Highly enantio- and diastereoselective organocatalytic Mannich additions of alpha-isothiocyanato imides to sulfonyl imines are reported. Enantiomerically enriched syn-alpha,beta-diamino acidderivatives can be obtained in excellent yields using catalyst loadings as low as 0.25 mol %.